GoogleGuy has just commented over at WebMaster World about possible future measures to try a combat scraper sites with using AdSense. A link could appear within the feedback page when you click on the "Ads by Goooogle" part of the advert. This could make it possible for anyone to report any page to Google with AdSense on it.

"I'm talking to some people on that side of the company about how to get spam out of AdSense. It may be that we can designate a keyword to use (like "spamreport") in the "Ads by Goooogle" feedback link."